Presets

Presets wrap common CDP command sequences into one-click actions, so you don’t have to hand-write the method and params yourself.

For custom HTTP headers, open the Network tab and follow the custom headers guide.

Capture screenshot

Grab a PNG, JPEG, or WebP screenshot of the current page, optionally capturing the full scrollable page rather than just the viewport.

Screenshot capture - format, quality (for JPEG/WebP), and full-page option.

Device emulation

Switch between built-in device profiles (iPhone, iPad, Pixel, Desktop) or create and save your own custom profiles. See Device profiles below for the full create/edit flow.

Device emulation - pick a profile, then Apply or Clear.

Location emulation

Override the page’s geolocation with a specific latitude, longitude, and accuracy via Emulation.setGeolocationOverride - useful for testing location-aware features without physically moving. Fields are validated as you type (lat −90..90, long −180..180, accuracy ≥0), but the red error state only appears after you’ve started editing, not on a freshly-opened blank form. Clear location is always available once connected - it sends Emulation.clearGeolocationOverride() to make the page fall back to real/normal geolocation behavior, without resetting the fields you’d typed.

Location emulation. The remote page must still accept the geolocation permission prompt.

Execute JavaScript

Run arbitrary code on the attached page via Runtime.evaluate and see the return value (or a thrown error) in the Result box.

• “Wrap in async IIFE (try/catch)” (checked by default) wraps your code in an async function with its own try/catch, so a plain return statement works (e.g. return document.title;). A thrown error is logged to the page’s own console and shown in the Result box. Return values are JSON-serialized: strings, booleans, finite numbers, plain objects/arrays (including nested), and DOM elements (shown as tag + attributes) come through; anything else - functions, Map/Set, NodeList, NaN/Infinity - comes back as the literal string "unparsable object".
• “Await promise” is force-checked and disabled whenever the IIFE wrap is on (since the wrapper always returns a Promise). Uncheck the wrap option to make Await a free toggle again - in that mode your code must be a bare expression, not a return statement, and the result uses CDP’s own formatting instead of the custom serializer.

Execute JavaScript - querying the live page's title, URL, and element counts, with the JSON result shown below.